Firstly may I say that in general you should ALWAYS read dosage instructions carefully and adhere to them.
However on this occasion, I don't think you have anything to worry about as far as the taking of those 3 pills is concerned.
Very high levels of Vitamin B12 supplements - doses of 2000mcg daily (about 4 times higher than the dose you have taken) are sometimes administered orally - in cases of severe deficiency problems such as pernicious anemia.
The Vitamin B12 Recommended Dietary Allowance (RDA) for a (healthy) female aged 14+ is 2.4 mcg.
If you took 3 x 16,667% B12 supplement pills, you have taken 500 times over the RDA which might be in the order of 1000 mcg. ( 1 milligram )
The Institute of Medicine (IOM) of the National Academies advises that there are NO adverse effects associated with excess vitamin B12 intake from food and supplements in healthy individuals.
Furthermore, a trial in which Vitamin B12 was administered at 1000mcg per day for 5 years did not cause any "serious adverse events".
As a result of this (and other trials) the IOM has not set any value for a "Tolerable Upper Intake Level" (UL) - clearly they do not consider that the dose you have taken is any risk whatsoever.
I quote the following : "... Health Risks from Excessive Vitamin B12 The IOM did not establish a UL for vitamin B12 because of its low potential for toxicity. In Dietary Reference Intakes: Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline, the IOM states that "no adverse effects have been associated with excess vitamin B12 intake from food and supplements in healthy individuals" .
Findings from intervention trials support these conclusions. In the NORVIT and HOPE 2 trials, vitamin B12 supplementation (in combination with folic acid and vitamin B6) did not cause any serious adverse events when administered at doses of 0.4 mg for 40 months (NORVIT trial) and 1.0 mg for 5 years (HOPE 2 trial) [62,63]. ..."
From the Office of Dietary Supplements / National Institutes of Health website Dietary Supplement Fact Sheet for Vitamin B12, at :
Please do not let yourself worry about this, but it is perhaps best to mention any concerns you may have to your Doctor, who will put your mind at rest.
-- Best wishes - Majikthise.
I have to take B12 daily due to having Pernicious anemia (I'll literally die if I don't take it) and my Dr. says that excessive B12 we just urinate back out, but taking large amounts of B12 regularly when you don't need it has been shown to make for overactive blood cells and promote cancer growth. I doubt there will be a problem this one time but I definitely would not suggest doing it again, anything taken to such an extreme is not good for you.
B12 is non-toxic and is crucial for several cellular functions. Some medical experts do think the US recommended daily allowance is far too low. However, 50,000% seems very excessive and taking such large doses might have consequences, especially since it's possible to consume more of a particular vitamin than your body needs or uses. Vitamin B12 can also interact negatively with some synthetic drug. Best to speak with a doctor or pharmacist.
The symptoms of the overdose of vitamin B12 are numbness of any parts of body, itch, or a feeling of burning pain or pricking, headache, giddiness, excitement, pains in the heart, the heart doesn't work normally. Insure you do not do it again because it can cause fatty liver which a person can not live on... If you are healthy odds are you should be fine, but if you are really concerned just call your doctor. Rather safe than sorry
thanks. i thought it said 16.667% but i mistook a . for a , and it said 16,667%.
the pill i took said 16,667% and i read it wrong. i thought it said 16.667%
It did affect my memory when it was untreateed, it does not anymore.
Everyone is giving an answer with a big explination. simply: no.
i took a little over 50000% of the recommended daily value.
Medical advice rarely involves a yes or no answer :)
Does your anemia mess with ur memory?
yeah i had about 3025 mg altogether.
sorry mcg. bad typing.
so i took 3